Hypodermic syringe



Jan. 17, 1956 A. E. sMlTH 2,495,026

HYPODERMIC SYRINGE Filed sept. 14, 1946 Mmm/@.5 JM/W/ BY mm k INVENTORZ ATTORNEY.

Patented Jan. 17, 1950 unirEn- STAT entre :Mas-,02a

HI-PODERMIC? SSE-RINGE Arthur.- Smith, L`os Angeles, Calif'.

Applica-tion September 14311946; SerialNi'r: 6%??075'v 1-.1 This invention: relates to improvement'siin hy podermic syringessofa type-in whiclithe-medic-f inal compound is' by the rnanufacturen` delivered in a sterilized cartridge.l commonly: termed an ampule, mountable on thesyringeand" axially--v upon completionof'thecinjection; Another object f is to provide a device which may be quickly taken. apart for cleaning and sterilization. A stillE funther Objectis to` provide means'for tightlymovering'V the needlesof' the device so as tomaintaintheA needles in` a sterilen condition, and alsoi in order'toprotect'the needles from injurypr-'breakage: Another'object-is to provide a dev-ice; theparts of which. may be manipulated during the operation of administering a medicinal come pound to determine whether or not the needle-ac'- cidentally has entered' a blood vessel. Another object of the invention is to provide an injection needle with means for producing a fluid tight joint, also means to prevent dislodgment of the needle during injection of a medicinal compound into the patient. These and other objects and the many advantages of the invention will be better understood from the following detailed description and by referring to the accompanying drawings of which: 1

Fig. l is a general view of the needle holder or syringe proper of the invention;

Fig. 2 is a substantially corresponding View taken in the direction of the arrow 2 of Fig. 1;

Fig. 3 shows the completely assembled device as it appears when ready for use;

Fig. i shows the front end of the needle holder; and

Fig. 5 illustrates the rear end thereof;

Fig. 6 is a sectional side view of the ampule of the invention;

Fig. 7 is an end View of this ampule;

Fig. 8 isa sectional view of a member of the ampule as it appears when separated therefrom; and

Fig. 9 illustrates a stylet which is insertable through the needles of the device when the syringe is not in use, thereby to prevent clogging the lumens of the needles.

The structure of the invention, in the form i1- lustratedf.` i'rrn thee` drawings,. comprises;` generally a rreedlesholder: Ai andiacontainer vor;ampulel-for armedicinalicnmpound:

The#l needle'.` holden; on syringe.l proper.; consists of a cylindrical body I throughi the lumen'` of which.: entendsraf-.needlel The frontend ofi the body isshown: somewhatetapered, substantially as: indicatedf at? le; andi it isrftted with screw threads. lbf' at:V thef. root: ofthe'; tapered# portion thereof-i.

Therneedies afs: a whole; is'- in. this: device; made two: parts,l namely; the.;` aboveV named? inner needle: endlE 2 .and-1 anwinj ectorrportion or` needle 3f. The latten isf.` supportedi-by'fa tubular head. 4. the

inner end@ off whichiis recessed tof'orm therein a tapered seatidfor theitaperedf endLporti'ony Ia' offthetvbody.; screwf threadsiltl?" are provided attire Aentram:eztmtherecesslfor: engagement;y with thesthreadscllrothebody:

When? the needle/head is: screwed in position ont thej end of? the` body, it; is. found-f that' a fluid tight* joint is: provided; and'i that:` the two parts of the. syringe@ become? firmly: interlocked; which .preyentsztheineedleirom becomingdislodgedv dur- .inginection The ampule B consists of a shorttube, made from transparent material and tted at one end with a soft-rubber closure 6, which is internally recessed to provide a central diaphragm 6a. In the tube 5 is seated a piston l, and this piston is internally threaded, or fitted with a metal insert 8 which is internally threaded to receive the screw threads of a shoulder portion Ic at the -inner end of the syringe body I.

The ampule is designed to hold a given quantity of any desired medicinal compound such as penicillin-oil-wax and this compound is, by the manufacturer, injected through a hypodermic needle (which is projected through the diaphragm 6a) into the space 9 between the piston 'I and the closure G. It is important to note that the piston 1 is slidable within the ampule to determine the quantity of medicinal compounds to be injected therein.

In order to mount the ampulein position, it is merely required to place the Open end thereof over the end of the syringe body I and to adivance the ampule on the body until the inner needle 2 passes through the threaded perforation of the insert 8 and the shoulder Ic reaches this perforation, whereupon a few relative turns causes the shoulder to seat tightly within the insert and the end of the needle to penetrate the diaphragm 'Ia of the piston. By referring to Fig. 3, it is noticed that the end of the needle 2 after penetrating the diaphragm 'ln extends into the recess 'Ib of the piston until the point of the needle is flush with the end of the piston. The assembled syringe is now ready for use.

A sheath Il is placed over the injection needle and this sheath is made With internal screw threads which engage a threaded shoulder llc of the needle holder 4 to lock the sheath firmly in position thereon. As a further protection, a stylet l2 is inserted through the lumens Vof the needles 2 and 3. This stylet is fitted with a knob I3 which is internally threaded to engage theA l threads of the body shoulder IC, which locks the stylet rmly in position thereon. The unit in this manner assembled should now be sterilized and retained for future use.

A threaded recess, said plunger having an exteriorly threaded outer end, a tubular head having an @axial bore therethrough and having its inner end To operate the syringe, the sheath Il is re moved from the threaded portion 4 and needle 3 is inserted to the proper depth into the tissues of the patient, whereupon a check should be made to determine whether or not the end of the needle has punctured a blood vessel. Such check is effected simply by a slight withdrawing movement of the ampule which causes suctionl because of the vacuum created. p

If the point of needle 3 has punctured a blood vessel, blood will be aspirated intospace 9` of ampule B. Because injection of the compound into a blood vessel might prove fatal, Vit is seen that such check by retraction of the ampule forms a most important feature of the invention.

Having successfully completed the check, it is merely required to force the ampule forward over the syringe body I by placing the thumb over the closure 6 and holding the hexagonal grip l0 of the body between the first and second fingers. The piston 'I is thereby-caused to advance Within the ampule until the Vconvex end thereof comes to rest within the concave recess (ib of the closure 6. All of the compound has now been ejected from the ampule without leaving any waste whatever, which completes the injection. The empty ampule is then unscrewed and discarded.

This application is a continuation-in-part -of my co-pending application Serial No. 680,748, 45

filed July 1, 1946.

interiorly threaded and being adapted to engage the outer end threaded portion of said plunger, said inner needle in the plunger bore having an inner end adapted to be disposed in the threaded 'recess of said piston stopper, an injector needle having a sharpened outer end and having an inner end seated within said tubular head, said plunger being rotatable relative to the piston stopper to cause the inner end of the inner needle to pierce the piston stopper closing means to thereby place the inner needle in communication with the contents of the ampule whereby the contents of the ampule may be discharged through the inner needle, the tubular head, and the injector needle.

ARTHUR E. SMITH.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 

